ABSTRACT A high efficiency LED(Light Emitting Diode) driver based on Buck converter, which could operate under a wide AC input voltage range(85V~265V) and drive a series of high power LEDs, is presented in this paper. The operation principles, power loss factors of the LED driver in this study are analyzed and discussed in detail and some effective ways to improve efficiency are proposed through system design considerations. To verify the feasibility, a laboratory prototype is also designed and tested for an LED lamp which consists of 16 LUMILEDS LEDs in series. Experimental results show that a high efficiency of 92% at I0=350mA can be achieved and the studied driver might be practical for driving high power LEDs. In the last, the overall efficiency over 90% is gained through some experiments under variable input and output voltages and verifies the validity of the designed driver.
Cite this paper
nullR. Xu, H. Li, Y. Li and X. Hou, "Research on a High-Efficiency LED Driving Circuit Based on Buck Topology," Circuits and Systems, Vol. 2 No. 4, 2011, pp. 352-357. doi: 10.4236/cs.2011.24048.
 Y. K. Cheng and K. W. E. Cheng, “General Study for Using LED to replace Traditional Lighting Devices,” 2nd International Conference on Power Electronics Systems and Applications, Hong Kong, 12-14 November 2006, pp. 173-177. doi:10.1109/PESA.2006.343093
 E.-W. Wu, T.-Fu. Wu, J.-R. Tsai, Y.-M. Chen and C.-C. Chen, “Multistring LED Backlight Driving System for LCD Panels with Color Sequential Display and Area Control,” IEEE Transactions on Industrial Electronics, Vol. 54, No. 10, 2008, pp. 3791-3800.
 M. Rico-Secades, A. J. Calleja, J. Ribas, E. L. Corominas, J. M. Alonso, J. Car-desin and J. Garcia-Garcia, “Evaluation of a Low-Cost Permanent Emergency Lighting System Based on High-Efficiency LEDs,” IEEE Transactions on Industry Applications, Vol. 41, No. 5, 2005, pp. 1386-1390. doi:10.1109/TIA.2005.853389
 K. H. Loo, W.-K. Lun, S.-C. Tan, Y. M. Lai and C. K. Tse, “On Driving Techniques for LEDs: Toward a Generalized Methodol-ogy,” IEEE Transactions on Power Electronics, Vol. 24, No. 12, 2009, pp. 2967-2976.
 M. Nishika, Y. Ishizuka, H. Matsuo, et al., “An LED Drive Circuit with Constant Output Current Control and Constant Luminance Control,” 28th Telecommunications Energy Conference, Providence, September 2006, pp. 1-6.
 H. V. D. Broeck, G. Sauerlander and M. Wendt, “Power Driver Topologies and Control Schemes for LEDs,” Twenty Second Annual IEEE of Applied Power Electronics Con-ference, Anaheim, 25 February-1 March 2007, pp. 1319-1325.
 F.-F. Ma, W.-Z. Chen and J.-C. Wu, “A Monolithic Current-Mode Buck Converter with Advanced Control and Protection Circuits,” IEEE Transactions on Power Electronics, Vol. 22, No. 5, 2007, pp. 1836-1846.
 H.-J. Chiu, Y.-K. Lo, J.-T. Chen, S.-J. Cheng, C.-Y. Lin and S.-C. Mou, “A high-Efficiency Dimmable LED Driver for Low-Power Lighting Applications,” IEEE Transactions on Industrial Electronics, Vol. 57, No. 2, 2010, pp. 735-743. doi:10.1109/TIE.2009.2027251
 D. Gacio, J. M. Alonso, A. J. Calleja, J. Garcia and M. Rico-Secades, “A Universal-Input Single-Stage High-Power-Factor Power Supply for HB-LEDs Based on Integrated Buck-Flyback Converter,” Twenty-Fourth Annual IEEE of Applied Power Electronics Conference and Exposition, Washington, DC, 15-19 February 2009 pp. 570-576.
 J. M. Alonso and M. A. Dalla Costa, “Integrated Buck-Flyback Converter as a High-Power-Factor Off-Line Power Supply,” IEEE Transactions on Industrial Electronics, Vol. 55, 2009, pp. 1090-1100.
 J. A. Villarejo, J. Sebastian, F. Soto and E. de Jodar, “Optimizing the De-sign of Single-Stage Power-Factor Correctors,” IEEE Transactions on Industrial Electronics, Vol. 54, No. 3, 2007, pp. 1472-1482.
 B. Wang, X. Ruan, K. Yao and M. Xu, “A Method of Reducing the Peak-to-Average Ratio of LED Current for Electrolytic Capacitor-Less AC-DC Drivers,” IEEE Transactions on Power Electronics, Vol. 25, No. 3, 2010, pp. 592-601. doi:10.1109/TPEL.2009.2031319
 L. Zhao and A. Q. Zhu, “Design of Energy-Saving Intelligent LED Illumi-nation System,” Semiconductor Technology, Vol. 33, No. 2, 2008, pp. 137-140.
 W. Lin, H. Song, Z. Y. Lu and G. Hua, “A High Efficiency Gate-Driving Scheme of Synchronous Rectifiers in Wide-Input-Voltage-Range CCM Flyback Converter,” 37th IEEE Power Electronics Specialists Conference, Jeju, 18-22 June 2006, pp. 1-6.
 M. Schmid, D. Kuebrich, M. Weiland, and T. Duerbaum, “Evaluation on the Efficiency of Power LEDs Driven with Currents Typical to Switch Mode Power Supplies,” Conference Record of the 2007 IEEE Industry Applications Conference, New Orleans, 23-27 September 2007, pp. 1135-1140.
 Y. Hu and M. M. Jovanovic, “LED Driver with Self-Adaptive Drive Voltage,” IEEE Transactions on Power Electronics, Vol. 23, No. 6, 2008, pp. 3116-3125.